import java.util.Scanner;

/*
    @author:sa
    @date:2024/11/7 9:40
*/
public class Demo01 {
    public static void main(String[] args) {
        System.out.println("请输入身高，体重，年龄");
        Scanner scanner= new Scanner(System.in);
        double str1=scanner.nextDouble();
        double str2=scanner.nextDouble();
        double str3=scanner.nextDouble();
        double s1=(str2*1.20/str1*str1)+0.23*str3-5.4;
        System.out.println(s1);
    }
}